 The extant churches are the Old Congregational Church, First Baptist Church, St. Peter's Church, the Universalist Church/Stark House and St. Mary's Roman Catholic Church.The commercial buildings in the Sycamore Historic District, located in Sycamore, Illinois, United States are mostly located in and around the city's downtown.The largest concentration of commercial contributing properties to the historic district are found along Illinois Route 64 as it passes through Sycamore.